Deoxidized exhaust steam condensing device for mixed recovery of condensate water and desalted water

Abstract

The invention relates to a deoxidized exhaust steam condensing device for mixed recovery of condensate water and desalted water. A first water inlet pipe, a second water inlet pipe, a third water inlet pipe and a fourth water inlet pipe are connected onto the circumference of a pressure-bearing buffer tank, wherein the first water inlet pipe and the third water inlet pipe are located on the upper layer, and the second water inlet pipe and the fourth water inlet pipe are located on the lower layer; synthesis ammonia cooled desalted water and conversion cooled desalted water are introduced into the first water inlet pipe and the third water inlet pipe respectively, and calcining furnace condensate water and fluidized bed condensate water are introduced into the second water inlet pipe and the fourth water inlet pipe respectively; the top of the pressure-bearing buffer tank is connected with a buffer tank steam discharge pipe; a buffer tank water outlet pipe is connected with a first water pump, an outlet of the first water pump is connected to a deaerator head water inlet pipe of a high-pressure deaerator, a deaerator tank drain pipe is connected to a boiler water replenishing pipe through a third water pump, the deoxidized exhaust steam becomes deoxidized exhaust steam condensate water after condensed by a second heat exchanger, and the deoxidized exhaust steam condensate water enters a condensate water collecting tank and is sent to the pressure-bearing buffer tank by a second water pump; and drain outlets are formed in a bottom plate of the pressure-bearing buffer tank and connected with a blow-down pipe, and a second control valve is mounted on the blow-down pipe. According to the device, the utilization rate of condensate water waste heat is high, and the operation is reliable.

Description

technical field [0001] The invention relates to a condensed water and desalinated water mixed recovery condensing device for deoxygenation and exhausted steam, which can be used for the recovery of high-temperature condensed water and heated desalinated water produced in the production line of an alkali plant. Background technique [0002] In order to prevent thermal equipment and its pipelines from corroding, and prevent non-condensable gases from mixing into steam to reduce steam quality, dissolved oxygen and other non-condensable gases dissolved in boiler make-up water must be removed, often through deaerators. According to Henry's law and Dalton's law, for various gases dissolved in water, under a certain pressure, the higher the temperature of the water, the lower the solubility; or under a certain pressure, the lower the partial pressure of the gas, the gas the lower the solubility. Thermal deoxygenation means that when the boiler replenishment water is heated to the ...

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Problems solved by technology

[0004] The above recovery methods have the following disadvantages: 1. The deaerator is atmospheric type, and the working temperature is about 104°C, but the actual temperature after mixing the condensed water and desalinated water is far higher than 104°C, so the excess part can only pass through the deaerator head A large amount of flash tank connected to the deaerator is empty, wasting a lot of waste heat and water resources

2. The temperature difference between condensed water and desalinated water is large. It is difficult to achieve a balance of heat in an instant through direct mixing and heat transfer. Therefore, thermal explosion is prone to occur in the deaeration box, which affects the safe operation of equipment.

3. There is a contradiction between the intermittent water replenishment of the boiler and the continuity of condensed water generation: when the boiler does not replenish water or the amount of water replenished is not large, the opening of the valve for the condensed water entering the deaerator of the calciner is small, the pressure of the system is suppressed, and the calciner grate The condensate water is not smooth; when the boiler replenishes a large amount of water, the valve opening of the calciner condensate water into the deaerator is large, the back pressure of the system is reduced, and the calciner steam is connected to the deaerator, which intensifies the discharge of waste heat

4. The volume of the deaeration box is limited, and it cannot form an effective buffer between the boiler unit and the production unit

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